Answer please I will mark u as brainlist​

Explanation:

1) velocity = displacement/time

time = displacement/velocity

time = 200/660

= 10/33

= 0.303

2) vf = vi - a*t

0 = 30 - 9.8*t

t = 30 ÷ 9.8

t = 3.06 seconds

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.